package ahxu.crawler.utils;

import java.security.MessageDigest;

public class MD5Utils {
	public static String encode(byte[] content) {
		String ret = null;
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			ret = convertToHex(md.digest(content));
			return ret;
		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return ret;
	}
	
	private static String convertToHex(byte[] data) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) {
        	int halfbyte = (data[i] >>> 4) & 0x0F;
        	int two_halfs = 0;
        	do {
	        	if ((0 <= halfbyte) && (halfbyte <= 9))
	                buf.append((char) ('0' + halfbyte));
	            else
	            	buf.append((char) ('a' + (halfbyte - 10)));
	        	halfbyte = data[i] & 0x0F;
        	} while(two_halfs++ < 1);
        }
        return buf.toString();
    }

}
